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某油田三类油层是指一、二类油层井网控制不住、动用不好的储层,以有效厚度小于1m、渗透率小于100m D的表内薄层及表外层为主。通过室内试验及现场试注,评价强碱体系对三类油层的储层伤害。结果表明,三类油层以弱或中等偏弱碱敏为主,且强碱体系对油层堵塞现象不明显,不会造成三类油层堵塞,可以顺利注入驱,为实现储量的有序接替做好准备。
The third type of oil layer in a certain oil field refers to the first and second types of well patterns that can not be controlled by well patterns and are not well-utilized reservoirs. The thin and superficial layers in the sheet are less than 1 m in effective thickness and less than 100 m in permeability. Through laboratory tests and field test, the reservoir damage of three kinds of oil reservoirs by alkali system was evaluated. The results show that the three types of reservoirs are mainly weak or moderately weak alkali-sensitive, and the strong alkali system does not block the reservoir obviously, which will not cause blockage of the three types of reservoirs and can be successfully injected into the flooding, so as to achieve orderly replacement of reserves ready.